关于c＃：将任意数据从局部视图传递到布局视图

Pass arbitrary data from a partial view to the layout view

更新：我似乎是在一个局部视图中设置viewbag内容，而不是在一个普通视图中，MVC3使这一操作非常容易。我仍然感兴趣为什么它不适用于局部视图，也就是说，为什么视图包不能与局部视图共享。

我试图通过使用ViewData/ViewBag将部分视图中的一些数据传递给布局视图。

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// Used in the partial view
public static void RequireAssets(this HtmlHelper helper, params Asset[] assets)
{
var alreadyRequired = helper.ViewData["RequiredAssets"] as List<Asset>;
if (alreadyRequired == null)
{
alreadyRequired = new List<Asset>();
helper.ViewData.Add("RequiredAssets", alreadyRequired);
}

foreach (var asset in assets.Where(anAsset => !alreadyRequired.Contains(anAsset)))
alreadyRequired.Add(asset);
}

// Used in the layout view
public static MvcHtmlString RenderAssetStyles(this HtmlHelper helper)
{
var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>;
return requiredAssets == null ? null : GetStyleSheets(requiredAssets.Select(e => new StyleSheet(e)).ToArray());
}

public static MvcHtmlString RenderAssetScripts(this HtmlHelper helper)
{
var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>;
return requiredAssets == null ? null : GetScripts(requiredAssets.Select(e => new Script(e)).ToArray());
}

问题是，当在布局视图中激发renderassets样式/脚本时，ViewData不包含键"RequiredAssets"

用法

SytLM.CsHTML:

1 2	@ViewBag.Title @Html.RenderAssetStyles()

部件视图.cshtml：

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@{
Html.RequireAssets(Assets.Grid, Assets.FileUpload);
}

我不能复制这个。我必须简化您的代码并做出一些假设。但是下面的工作对我来说很好。

第四讲

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@using MyProject.Helpers
@ViewBag.Title
@Html.RenderAssetStyles()
@Html.RenderAssetScripts()
@RenderBody()

CVTML

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@using MyProject.Helpers
@{
ViewBag.Title ="View";
Html.RequireAssets(Asset.Grid, Asset.FileUpload);
Layout ="~/Views/Shared/_Layout.cshtml";
}

HelpS.CS

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MyProject.Helpers
{
public enum Asset
{
Grid=1,
FileUpload=2
}
public static class Helper
{

public static void RequireAssets(this HtmlHelper helper, params Asset[] assets)
{
var alreadyRequired = helper.ViewData["RequiredAssets"] as List<Asset>;
if (alreadyRequired == null)
{
alreadyRequired = new List<Asset>();
helper.ViewData.Add("RequiredAssets", alreadyRequired);
}

foreach (var asset in assets.Where(anAsset => !alreadyRequired.Contains(anAsset)))
alreadyRequired.Add(asset);
}

// Used in the layout view
public static MvcHtmlString RenderAssetStyles(this HtmlHelper helper)
{
var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>;
return requiredAssets == null ? null : MvcHtmlString.Create("Test Style");
}

public static MvcHtmlString RenderAssetScripts(this HtmlHelper helper)
{
var requiredAssets = helper.ViewData["RequiredAssets"] as List<Asset>;
return requiredAssets == null ? null : MvcHtmlString.Create("Test Script");
}
}

}